/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.alibaba.rocketmq.client.consumer;

import com.alibaba.rocketmq.common.message.MessageQueue;

import java.util.Set;


/**
 * A MessageQueueListener is implemented by the application and may be specified when a message queue changed
 *
 * @author shijia.wxr
 * @author vongosling
 */
public interface MessageQueueListener {
    /**
     * @param topic
     *         message topic
     * @param mqAll
     *         all queues in this message topic
     * @param mqDivided
     *         collection of queues,assigned to the current consumer
     */
    void messageQueueChanged(final String topic, final Set<MessageQueue> mqAll,
                             final Set<MessageQueue> mqDivided);
}
